The word "to walk" comes from the word "walking," as I understand it!? If I did not step on a single sand cell, then according to those rule links you provided, I did not violate them? And yes, the only advantage I could theoretically gain by flying over — I emphasize over the ZONE — is scouting 5 cells, but alas, I then immediately ran along those same 5 cells having movement. And in general, if we are discussing flight in this case, the question arises: if I, say, have wings and, while in my zone on the map, click on any GO in my zone, fly the shortest path to it, and you say that is wrong and that I should essentially not use them and run around, throw away the wings?! that is complete nonsense, don't you think? especially since we're talking about 5-6 cells; I have personally seen Yurist hit shifted GO on Jebus by penetrating the sand zone, ignoring the first GO and killing the second or third GO in line! What are we even talking about?! There were no actions before breaking the GO, including walking in the zone and capturing objects.
Added after 6 minutes
A couple of weeks ago, I saw a similar situation on Lizard's stream in a game against Yurist (I wanted to take a screenshot now, but both only have water until July 16, couldn't find it). Lizard broke his GO, and then the road slightly extended into the swamp resp, while the swamp resp's GO stood on it. At the same time, it was possible to pass into the center nearby over the sand. Lizard claimed it was all fine and flew all his heroes along the road over the swamp GO, and the road was located on the swamp resp. So — was that penetration or not?
I formalize the question for all three situations: is flying over a zone without stopping in it considered penetration into the zone? It doesn't matter what the answer is; what matters is that it is unambiguously reflected in the rules.